linux-kernel - [PATCH 0/4] KDB: Fix dmesg command

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Date:	Fri, 20 Jul 2012 17:25:29 -0700
From:	Anton Vorontsov <anton.vorontsov@...aro.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Kay Sievers <kay@...y.org>,
	Jason Wessel <jason.wessel@...driver.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, kgdb-bugreport@...ts.sourceforge.net
Subject: [PATCH 0/4] KDB: Fix dmesg command

Hi all,

The dmesg command appears to be broken after the printk rework. The old
logic in the kdb code makes no sense in terms of current printk/logging
storage format, and KDB simply hangs forever upon entering 'dmesg'
command.

The first patch revives the command by switching to kmsg_dumper iterator.
As a side-effect, the code is now much more simpler.

A few changes were needed in the printk.c: we needed unlocked variant
of the kmsg_dumper iterator, but these can surely wait for 3.6.

It's probably too late even for the first patch to go to 3.5, but
I'll try to convince otherwise. :-) Here we go:

- The current code is broken for sure, and has no hope to work at
  all. It is a regression;
- The new code works for me, and probably works for everyone else;
- If it compiles (and I urge everyone to compile-test it on your
  setup), it hardly can make things worse.

Thanks!

--
 include/linux/kmsg_dump.h      |   16 +++++++
 kernel/debug/kdb/kdb_main.c    |   91 +++++++++++++++-------------------------
 kernel/debug/kdb/kdb_private.h |    1 -
 kernel/printk.c                |   83 +++++++++++++++++++++++-------------
 4 files changed, 104 insertions(+), 87 deletions(-)

-- 
Anton Vorontsov
Email: cbouatmailru@...il.com
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